CN115196839B - Quick starting method of low C/N ratio wastewater enhanced denitrification treatment system - Google Patents

Quick starting method of low C/N ratio wastewater enhanced denitrification treatment system Download PDF

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CN115196839B
CN115196839B CN202210974855.9A CN202210974855A CN115196839B CN 115196839 B CN115196839 B CN 115196839B CN 202210974855 A CN202210974855 A CN 202210974855A CN 115196839 B CN115196839 B CN 115196839B
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ratio
sludge
concentration
reactor
tank
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CN115196839A (en
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黄勇
王征洋
陈梦雪
陈道康
俞朝庭
谈帅
韩笑
陈枫
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Nanjing Gaoke Environmental Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/15—N03-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/16—Total nitrogen (tkN-N)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a quick starting method of a low C/N ratio wastewater enhanced denitrification treatment system. The method is characterized in that through an AAOA operation mode of anaerobic/anoxic/aerobic/anaerobic ammoxidation, short-cut nitrification occurs in an A/O carbon removal tank, and the concentration of dissolved oxygen is controlled to ensure that a stable reaction matrix is provided for anaerobic ammoxidation; the concentration of the reaction matrix can be adjusted by the arranged feed liquid overrun route and the internal and external circulation route of the Anamox reactor, so that the effluent quality is ensured to reach the standard; under the micro-aerobic environment, functional bacteria such as ammonia oxidizing bacteria, nitrite oxidizing bacteria, anaerobic ammonia oxidizing bacteria, heterotrophic bacteria and autotrophic bacteria in the system coexist and produce mutual synergistic effect, so that the demand of a biological denitrification process for a carbon source is reduced, the consumption of organic matters in the denitrification process is reduced while the aeration energy consumption is reduced, and the deep denitrification treatment of urban sewage and wastewater with a low C/N ratio is realized.

Description

Quick starting method of low C/N ratio wastewater enhanced denitrification treatment system
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a quick starting method of a low C/N ratio wastewater reinforced denitrification treatment system, which is particularly suitable for deep denitrification treatment of low C/N ratio urban sewage represented by landfill leachate and the like.
Background
Sewage with low C/N ratio characteristics, such as insufficient carbon source in sewage treatment plants, has water inlet C/N ratio smaller than 3, and can not meet the requirements of microbial denitrification and dephosphorization. In order to ensure that the pollutant is discharged up to the standard, measures such as adding a carbon source, improving the reflux ratio, increasing the aeration rate and the like are generally needed to improve the denitrification and dephosphorization effects, and the sewage treatment cost and the energy consumption are increased. Therefore, developing a high-efficiency low-consumption treatment technology suitable for low-C/N ratio sewage has great significance in promoting the development of sewage treatment industry and improving the water environment quality.
Short-cut nitrification (PN) is a process in which ammonia oxidation is carried out to a nitrosation stage, and only Nitrite (NO) is accumulated 2 - -N) 25% less oxygen consumption and 40% less carbon source consumption than conventional nitration. Anaerobic ammoxidation (Anamox) is to oxidize ammonia nitrogen into nitrogen by directly taking ammonia as an electron donor and nitrite as an electron acceptor under the anoxic condition, so that the oxygen supply amount can be saved by more than 60%, and an additional organic carbon source is not needed, so that the anaerobic ammoxidation (Anamox) has the advantages of low sludge yield, low running cost, high denitrification efficiency and the like. The A/O decarbonizing pond of the system has short-range nitrification and controls NO in the effluent 2 - -N and NH 3 + The mass concentration ratio of the-N is 1.30-1.35:1, and a substrate NO can be continuously and stably provided for the anaerobic ammonia oxidation reaction 2 - -N。
Anaerobic ammonia oxidation bacteria have long generation time, expensive seed sludge and difficult inoculation and culture, and according to statistics, the conventional anaerobic granular sludge or denitrifying sludge inoculation starting reactor generally needs more than half a year to one year, even if mature AnAOB flora seed sludge is inoculated, the starting time is also quite long, so that the sludge inoculation and quick start of the Anamox reactor have important roles in practical engineering application. At present, studies have shown that low concentrations of inorganic salts activate the anaerobic ammoxidation reaction, while high concentrations of inorganic salts greatly inhibit the anaerobic ammoxidation reaction. In oxygen-limited environment, low concentration salt inhibits oxidation activity of nitrifying spira and prevents NO 2 - Conversion of N to NO 3 - -N, competing with anammox species; on the other hand, the osmotic pressure of the environment where the microorganism is positioned is changed, and the proper osmotic pressure can improve the metabolism capability of the microorganism and improve the NH in the water inlet matrix 3 + -N and NO 2 - Conversion efficiency of N.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem of low starting speed of the existing Anamox reactor, the invention provides a low C/N ratio wastewater enhanced denitrification treatment system and a rapid starting method.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention firstly provides a low C/N ratio wastewater reinforced denitrification treatment system, which comprises the following components in sequence:
a feeding box (1);
an EGSB anaerobic reactor (2), wherein the EGSB anaerobic reactor (2) is provided with an EGSB internal circulating pump (2.1);
an A/O decarbonizing tank (3);
the bottom of the secondary sedimentation tank (4) is connected with the inlet of the A/O decarbonization tank (3) through a sludge reflux pump (4.1);
an intermediate water tank (5);
an Anamox reactor (6), wherein the Anamox reactor (6) is provided with an Anamox reactor internal circulation pump (6.1) and an Anamox reactor external circulation pump (6.2), the Anamox reactor external circulation pump (6.2) is connected with the inlet of the A/O carbon removal tank (3), and the Anamox reactor external circulation pump (6.2) is used for refluxing supernatant to the inlet of the A/O carbon removal tank (3); and
a water producing tank (7).
Further, the front end of the A/O decarbonizing tank (3) is provided with an anoxic stirrer (3.2), and the rear end of the A/O decarbonizing tank is provided with a perforated aerator pipe (3.3) and a first water quality monitor (3.4) which are connected with the air compressor (3.1).
Further, the ratio of the front end volume to the rear end volume of the A/O carbon removal tank (3) is 1:3 to 4.
Further, the intermediate water tank (5) is provided with an intermediate water tank lifting pump (5.1) and a second water quality monitor (5.2); the intermediate water tank (5) is connected with the feeding box (1) through a feeding transfer pump (1.2), and the feeding transfer pump (1.2) is used for conveying the feeding liquid to an inlet of the intermediate water tank (5) in an overrunning mode.
Further, the device also comprises a PLC control cabinet (8); the device is characterized in that the first water quality monitor (3.4), the second water quality monitor (5.2) and the third water quality monitor (6.3) are connected with the PLC control cabinet (8), and the PLC control cabinet (8) is used for adjusting the operation parameters of the feeding transfer pump (1.2), the air compressor (3.1), the sludge reflux pump (4.1), the Anamox reactor internal circulation pump (6.1) and the Anamox reactor external circulation pump (6.2) according to real-time monitoring water quality data output signals.
Furthermore, HDPE plastic carriers (6.4) are filled in the Anamox reactor (6), and a third water quality monitor (6.3) is arranged at the top of the Anamox reactor.
Further, the HDPE plastic carrier (6.4) is selected from one or a combination of a plurality of porous hollow spheres, pall rings and built-in suspension fillers, the size is phi 20-25 mm, and the specific surface area is 500-800 m 2 /m 3 The porosity is greater than 92%, and the filling volume ratio is 20% -40%.
The invention also provides a quick starting method of the low C/N ratio wastewater enhanced denitrification treatment system, which comprises the following steps of:
a feed box;
an EGSB anaerobic reactor which is provided with an EGSB internal circulating pump;
the front end of the A/O decarbonizing tank is provided with an anoxic stirrer, and the rear end of the A/O decarbonizing tank is provided with a perforated aerator pipe connected with an air compressor and a first water quality monitor; the front end of the A/O carbon removal tank refers to one end, close to an inlet, of the inside of the A/O carbon removal tank, and the rear end refers to one end, close to an outlet, of the inside of the A/O carbon removal tank;
the bottom of the secondary sedimentation tank is connected with an inlet of the A/O decarbonization tank through a sludge reflux pump;
the middle water tank is provided with a middle water tank lifting pump and a second water quality monitor; the middle water tank is connected with the feeding tank through a feeding transfer pump, and the feeding transfer pump is used for conveying the feeding liquid to an inlet of the middle water tank in an overrunning manner;
the Anamox reactor is provided with an Anamox reactor internal circulation pump and an Anamox reactor external circulation pump, the Anamox reactor external circulation pump is connected with the A/O decarbonizing tank inlet, and the Anamox reactor external circulation pump is used for refluxing the supernatant to the A/O decarbonizing tank inlet; HDPE plastic carriers are filled in the Anamox reactor, and a third water quality monitor is arranged at the top of the Anamox reactor; and
a water producing tank;
the quick start method comprises the following steps:
step 1): the anaerobic reactor of the EGSB is connected with sludge in an anaerobic tank of an urban sewage treatment plant, the concentration of the sludge is controlled to be 4000-5000 mg/L, and the HRT=1-2 d;
step 2): the front end of the A/O decarbonizing tank is inoculated with denitrifying sludge (which means that the relative abundance of denitrifying bacteria is more than 55 percent and the denitrification rate is more than 0.06g NO) 3 - -N/g MLVSS.d activated sludge), and the back end is inoculated with secondary sedimentation tank reflux sludge (which means that the relative abundance of nitrifying bacteria is more than 5 percent and the nitrifying rate is more than 0.02g NH) 3 -N/g MLVSS.d activated sludge), the concentration of sludge at the front end and the rear end is controlled to be 3000-4000 mg/L, the concentration of dissolved oxygen at the front end is controlled to be 0.2-0.3 mg/L, the concentration of dissolved oxygen at the rear end is controlled to be 0.3-1.0 mg/L, and the volume ratio of the front end to the rear end is controlled to be 1: 3-4, total HRT=2-3 d, sludge reflux ratio of 50-100%, NO in effluent 2 - -N：NH 3 + -N＝1.30～1.35:1；
Step 3): mixing and inoculating river and lake sediment, denitrified sludge of an urban sewage treatment plant and optionally mature anaerobic ammoxidation sludge in an Anamox reactor, controlling the temperature to be 32-35 ℃, controlling the sludge concentration to be 3500-4500 mg/L, controlling the HRT=1-1.5 d, controlling the dissolved oxygen concentration to be 0.1-0.3 mg/L, and adding a HDPE plastic carrier and a low-concentration inorganic salt solution in a certain proportion; mature anaerobic ammoxidation sludge refers to granular sludge with the average diameter of 2.0-3.0 mm and the relative abundance of AnAOB flora of more than 50%;
in the steps 1), 2), 3) of inoculating sludge can be synchronously performed, and the water-passing reaction is performed according to the sequence of the steps 1), 2), 3);
step 4): gradually increasing the internal circulation reflux ratio and the external circulation reflux ratio of the Anamox reactor, and controlling the water outletMiddle NH 3 + -N<8mg/L，TN<20mg/L, and when the total nitrogen removal load of the anaerobic ammonia oxidation reaction is detected to be more than or equal to 0.3 gN/(L.d), the reactor is started successfully.
Preferably, the low C/N ratio wastewater enhanced denitrification treatment system further comprises a PLC control cabinet; the first water quality monitor, the second water quality monitor and the third water quality monitor are connected with the PLC control cabinet, and the operation parameters of the feeding transfer pump, the air compressor, the sludge reflux pump, the internal circulation pump of the Anamox reactor and the external circulation pump of the Anamox reactor are adjusted according to the water quality data output signals monitored in real time.
Preferably, the internal circulation reflux ratio of the Anamox reactor is between 100 and 200 percent, and the external circulation reflux ratio of the Anamox reactor is between 200 and 400 percent.
Preferably, the substrate concentration and the effluent quality of the reactor are controlled by adjusting the internal circulation reflux ratio and the external circulation reflux ratio of the Anamox reactor; when yielding water NH 3 + -N>When the concentration is 8mg/L, the internal circulation reflux ratio is gradually increased to 200 percent; when yielding water NH 3 + -N<8mg/L、TN>When the concentration is 20mg/L, the external circulation reflux ratio is gradually increased to 400 percent; wherein, the internal and external circulation reflux ratios are gradually increased according to a gradient of 50 percent, and the reaction is continued for 10 to 12 hours when one gradient is added until NH 3 + -N<8mg/L、 TN<20mg/L。
Preferably, when NO 2 - -N and NH 3 + Mass concentration ratio of-N>At 1.35:1, NH is increased by decreasing air compressor frequency or turning on feed transfer pump 3 + -N concentration.
Preferably, when NO 2 - -N and NH 3 + Mass concentration ratio of-N<At 1.30:1, NH is reduced by increasing the frequency of the air compressor or increasing the reflux ratio of the sludge reflux pump 3 + -N concentration to achieve NO in the intermediate tank 2 - -N and NH 3 + The mass concentration ratio of the-N is 1.30-1.35:1.
Preferably, the sludge inoculated in the step 3) can be formed by mixing river and lake sediment, denitrification sludge and mature anaerobic ammoxidation sludge according to the ratio of 4-6:3:1. The river and lake sediment can be river channel sediment, lake sediment and sewer sediment of urban eutrophication.
Preferably, the sludge inoculated in the step 3) can be formed by mixing river and lake sediment and denitrification sludge according to the proportion of 5-7:3. The sediment in natural water bodies such as rivers and lakes contains a certain amount of AnAOB flora, so that the inoculation proportion of the sediment in the rivers and lakes can be properly increased when no mature anaerobic ammonia oxidation sludge is sourced, the abundance of the AnAOB flora in the inoculation sludge is improved, and the reaction starting time is shortened.
Preferably, the inorganic salt in the low concentration inorganic salt solution in the step 3) is selected from NaCl and Na 2 SO 4 、CaSO 4 、CaCl 2 Or KCl, wherein the concentration of the inorganic salt solution is 3-10 g/L.
Preferably, the HDPE plastic carrier is selected from one or a combination of a plurality of porous hollow spheres, pall rings and built-in suspension fillers, the size is phi 20-25 mm, and the specific surface area is 500-800 m 2 /m 3 The porosity is greater than 92%, and the filling volume ratio is 20% -40%.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The low C/N ratio wastewater reinforced denitrification treatment system couples short-cut nitrification, anaerobic ammonia oxidation and denitrification technology in one system, utilizes the synergistic effect of denitrification functional flora in a micro-aerobic environment, reduces the requirement of an external carbon source in the biological denitrification process, reduces the cost of medicament consumption, sludge treatment and the like while reducing the aeration energy consumption, and realizes the deep denitrification treatment of low C/N ratio urban sewage and wastewater;
(2) The rapid start method of the invention generates short-cut nitrification in the A/O decarbonizing pond through the AAOA operation mode of anaerobic/anoxic/aerobic/anaerobic ammoxidation, and controls the concentration of dissolved oxygen to ensure that a stable reaction matrix is provided for the anaerobic ammoxidation; the concentration of the reaction matrix can be adjusted by the arranged feed liquid overrun route and the internal and external circulation route of the Anamox reactor, so that the effluent quality is ensured to reach the standard; under a micro-aerobic environment, functional groups such as ammonia oxidizing bacteria, nitrite oxidizing bacteria, anaerobic ammonia oxidizing bacteria, heterotrophic bacteria and autotrophic bacteria in the system coexist and produce mutual synergistic effect, so that the requirement of a biological denitrification process on a carbon source is reduced, the energy consumption of aeration is reduced, the consumption of organic matters in the denitrification process is reduced, and the deep denitrification treatment of urban sewage and wastewater with a low C/N ratio is realized;
(3) According to the rapid start method, the low-concentration inorganic salt is added or the internal and external circulation proportion of the Anamox reactor is regulated, so that a growth environment suitable for AnAOB flora is created, the start time of the Anamox reactor can be shortened to 2-3 months, and the rapid start of the Anamox reactor is realized;
(4) The quick start method of the invention further uses NH in the effluent water quality 3 + The concentration of N, TN is used for regulating the internal circulation proportion and the external circulation proportion of the Anamox reactor, so that the concentration of a matrix in the reactor can be regulated, the inhibition of nitrous acid to AnAOB flora can be reduced, and the starting of the Anamox reactor can be further accelerated;
(5) The rapid start method of the invention is further implemented by using NO 2 - -N and NH 3 + The mass concentration ratio of the-N adjusts the dissolved oxygen amount or the feeding transfer amount or the reflux ratio of a sludge reflux pump in the A/O decarbonizing tank to control NO in the inlet water 2 - -N and NH 3 + The mass concentration ratio of the-N is 1.30-1.35:1, and the substrate NO can be continuously and stably provided for the anaerobic ammoxidation reaction 2 - -N, improving the reaction efficiency, further accelerating the start-up of the Anammox reactor;
(6) The water quality monitor is connected with the PLC control cabinet, the running conditions such as the water quality, the water quantity and the like of the inlet water are adjusted according to the water quality data output signals monitored in real time, the high-efficiency denitrification process devices adopted by the system are compact in structure, integrated intelligent regulation and control can be realized, and the system is particularly suitable for modularized integrated application of low C/N ratio urban sewage and wastewater treatment represented by landfill leachate.
Drawings
FIG. 1 is a schematic diagram of a low C/N ratio wastewater enhanced denitrification treatment system in accordance with the present invention;
FIG. 2 is a schematic flow chart of a method for quickly starting up a low C/N ratio wastewater enhanced denitrification treatment system according to the present invention;
in fig. 1: 1-a feeding box; a 2-EGSB anaerobic reactor; 3-A/O decarbonizing tank; 4-a secondary sedimentation tank; 5-an intermediate water tank; a 6-Anamox reactor; 7-a water producing tank; 8-a PLC control cabinet; 1.1-a feed pump; 1.2-a feed transfer pump; 2.1-EGSB internal circulation pump; 3.1-an air compressor; 3.2-anoxic stirrer; 3.3-perforating the aerator pipe; 3.4-a first water quality monitor; 4.1-a sludge reflux pump; 5.1-an intermediate tank lift pump; 5.2-a second water quality monitor; 6.1-Anamox in-reactor circulation pump; 6.2-Anamox reactor external circulation pump; 6.3-a third water quality monitor; 6.4-HDPE plastic carrier.
Detailed Description
It should be noted that when an element is referred to as being "mounted" on another element, it can be directly on the other element or two elements can be directly integrated; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be directly integrated with the two elements. In the meantime, the terms such as "front", "rear", "upper", "lower", "left", "right", "middle" and the like are also used in the present specification for convenience of description, but are not intended to limit the scope of the present invention, and the changes or modifications of the relative relationship thereof are considered to be the scope of the present invention which can be implemented without substantial modification of the technical content.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
As used herein, the term "about" is used to provide the flexibility and inaccuracy associated with a given term, metric or value. The degree of flexibility of a particular variable can be readily determined by one skilled in the art.
Concentrations, amounts, and other numerical data may be presented herein in a range format. It is to be understood that such range format is used merely for convenience and brevity and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of about 1 to about 4.5 should be interpreted to include not only the explicitly recited limits of 1 to about 4.5, but also include individual numbers (such as 2, 3, 4) and subranges (such as 1 to 3, 2 to 4, etc.). The same principle applies to ranges reciting only one numerical value, such as "less than about 4.5," which should be construed to include all such values and ranges. Moreover, such an interpretation should apply regardless of the breadth of the range or the characteristics being described.
The invention is further described below in connection with specific embodiments.
Example 1
As shown in figure 1, the low C/N ratio wastewater enhanced denitrification treatment system provided by the invention comprises a feeding box 1, an EGSB anaerobic reactor 2, an A/O decarbonizing tank 3, a secondary sedimentation tank 4, an intermediate water tank 5, an Anamox reactor 6, a water production tank 7 and a PLC control cabinet 8 which are sequentially connected.
The feeding box 1 is connected with the EGSB anaerobic reactor 2 through a feeding pump 1.1 and is connected with the intermediate water tank 5 through a feeding transfer pump 1.2;
the EGSB anaerobic reactor 2 is provided with an EGSB internal circulation pump 2.1, the outlet of the EGSB anaerobic reactor 2 is connected with the inlet of the A/O decarbonizing tank 3 through an overflow pipeline, further, the anaerobic tank sludge of the municipal sewage treatment plant is inoculated in the EGSB reactor 2, the sludge concentration is controlled to 4000-5000 mg/L, and the HRT=1-2 d;
the front end of the A/O decarbonizing tank 3 is provided with an anoxic stirrer 3.2, the rear end is provided with a perforated aeration pipe 3.3 and a first water quality monitor 3.4 which are connected with an air compressor 3.1, the outlet is connected with a secondary sedimentation tank 4 through an overflow pipeline, further, the front end of the A/O decarbonizing tank 3 is inoculated with denitrification sludge of an urban sewage treatment plant, the rear end is inoculated with secondary sedimentation tank backflow sludge of the sewage treatment plant, the concentration of the sludge at the front end and the rear end is controlled to be 3000-4000 mg/L, the concentration of the dissolved oxygen at the front end is 0.2-0.3 mg/L, the concentration of the dissolved oxygen at the rear end is 0.3-1.0 mg/L, and HRT=2-3 d, and the sewage treatment plant is dischargedNO in water 2 - -N：NH 3 + -N＝1.30～1.35:1；
The bottom of the secondary sedimentation tank 4 is connected with the inlet of the A/O decarbonization tank 3 through a sludge reflux pump 4.1, and the outlet is connected with the middle water tank 5 through an overflow pipeline;
the middle water tank 5 is provided with a middle water tank lifting pump 5.1 and a second water quality monitor 5.2, and the outlet is connected with an Anamox reactor 6 through a lifting pipeline;
the Anamox reactor 6 is provided with an internal circulation pump 6.1, an external circulation pump 6.2 is connected with an inlet of the A/O decarbonizing tank 3, the inside of the Anamox reactor 6 is filled with HDPE plastic carriers 6.4, the top of the Anamox reactor is provided with a third water quality monitor 6.3, and an outlet of the Anamox reactor is connected with a water production tank 7, and further, river and lake sediment, denitrification sludge of an urban sewage treatment plant and mature anaerobic ammoxidation sludge are mixed and inoculated in the Anamox reactor 6, the temperature is controlled to be 32-35 ℃, the sludge concentration is 3500-4500 mg/L, the HRT=1-1.5 d, the dissolved oxygen concentration is 0.1-0.3 mg/L, and a certain proportion of HDPE plastic carriers and low-concentration inorganic salts are added;
the first water quality monitor 3.4 and the second water quality monitor 5.2 are connected with the PLC control cabinet 8, and the operation conditions of the feeding transfer pump 1.2 and the air compressor 3.1 are adjusted according to the water quality data output signals monitored in real time; when NO 2 - -N and NH 3 + Mass concentration ratio of-N>At 1.35:1, NH is increased by decreasing the air compressor 3.1 frequency or turning on the feed transfer pump 1.2 3 + -N concentration; when NO 2 - -N and NH 3 + Mass concentration ratio of-N<At 1.30:1, NH is reduced by increasing the frequency of the air compressor 3.1 or increasing the reflux ratio of the sludge reflux pump 4.1 3 + Concentration of N to achieve NO in the intermediate tank 5 2 - -N and NH 3 + The mass concentration ratio of the-N is about 1.30-1.35:1;
the third water quality monitor 6.3 is connected with the PLC control cabinet 8, and adjusts the operation conditions of the internal circulation pump 6.1 of the Anamox reactor and the external circulation pump 6.2 of the Anamox reactor according to the water quality data output signals monitored in real time; when yielding water NH 3 + -N>At 8mg/L, the reflux ratio of the external circulation pump of the Anamox reactor is gradually increased to 400% of the total weight of the composition; when yielding water NH 3 + -N<8mg/L、TN>At 20mg/L, gradually increasing the reflux ratio of a circulating pump in the Anamox reactor to 200%; wherein, the internal and external circulation reflux ratios are gradually increased according to a gradient of 50 percent, and the reaction is continued for 10 to 12 hours when one gradient is added until NH 3 + -N<8mg/L、TN<20mg/L。
The following describes the detailed procedure of the system start-up method of the present invention in detail by way of example 2, which is intended to further illustrate the present invention and not to limit the scope of the invention as claimed.
Example 2
By adopting the low C/N ratio wastewater enhanced denitrification treatment system of the embodiment 1, the leachate of the Nanjing brown Wu Ou Yan Angeles household garbage transfer station is treated, and the quality of the feed liquid is as follows: COD concentration is 4000-5000 mg/L, NH 3 + N is 400-500 mg/L, TN is 500-600 mg/L, TP is 20-30 mg/L.
The quick start method shown in fig. 2 specifically comprises the following steps:
step 1): inoculating sludge from an anaerobic tank of an urban sewage treatment plant into the EGSB reactor 2, wherein the inoculated sludge is from the anaerobic tank of the sewage treatment plant of the Nanjing Xingang, and the sludge concentration is controlled to be 4000-5000 mg/L, and the HRT=1.5d;
step 2): the front end of the A/O decarbonizing tank 3 is inoculated with municipal sewage treatment plant denitrification sludge (from an anoxic tank of a Nanjing Xingang sewage treatment plant), the rear end is inoculated with sewage treatment plant secondary sedimentation tank reflux sludge (from a Nanjing Xingang sewage treatment plant secondary sedimentation tank), the front end sludge concentration and the rear end sludge concentration are respectively controlled to be 3000-4000 mg/L, the front end dissolved oxygen concentration is 0.2-0.3 mg/L, the rear end dissolved oxygen concentration is 0.3-1.0 mg/L, and the volume ratio of the front end to the rear end is about 1:3, HRT=2d, sludge reflux ratio is 100%, NO in effluent 2 - -N： NH 3 + -N＝1.30～1.35:1；
Step 3): in Anammox reactor 6 at 6:3:1, mixing and inoculating river and lake sediment (from Nanjing percha region Xing Wu Gou), urban sewage treatment plant denitrification sludge (from Nanjing Xingang sewage treatment plant anoxic tank) and mature anaerobic ammoxidation sludge (from certain anaerobic ammoxidation pilot plant of Nanjing university, namely granular sludge with average diameter of 2.0-3.0 mm and AnAOB flora relative abundance of more than 50 percent), controlling the temperature to be 32-35 ℃, controlling the sludge concentration to 3500-4500 mg/L, controlling HRT = 1d, controlling the dissolved oxygen concentration to be 0.1-0.3 mg/L, and adding HDPE plastic carrier and inorganic salt (3 g/L) with 20 percent of volume ratio;
step 4): when yielding water NH 3 + -N>At 8mg/L, gradually increasing the reflux ratio of an external circulation pump of the Anamox reactor to 400%; when yielding water NH 3 + -N<8mg/L、TN>At 20mg/L, gradually increasing the reflux ratio of a circulating pump in the Anamox reactor to 200%; wherein, the internal and external circulation reflux ratios are gradually increased according to a gradient of 50 percent, and the reaction is continued for about 12 hours when one gradient is added until NH 3 + -N<8mg/L、TN<20mg/L; when the total nitrogen removal load of the anaerobic ammonia oxidation reaction is detected to be more than or equal to 0.3 gN/(L.d), the reactor is started successfully.
The test results show that: effluent NH was detected by starting Anamox reactor 6 for 57 days 3 + The total nitrogen removal load is 0.462 gN/(L.d), the reaction is started successfully, and the N is 5-8 mg/L, the TN is 12-18 mg/L. After stable operation, the COD concentration of the effluent is 45-55 mg/L, TP<1mg/L, and meets the requirement of direct discharge of table 3 in the pollution control Standard of household refuse landfill (GB 16889-2008).
The above description of the invention and its embodiments has been given by way of illustration and not limitation, and the examples shown are merely examples of embodiments of the invention, without limitation to the actual embodiments. Therefore, if one of ordinary skill in the art is informed by this disclosure, embodiments and examples similar to the technical solution are not creatively devised without departing from the gist of the present invention, and all the embodiments and examples are considered to be within the protection scope of the present invention.

Claims (8)

1. A quick start method of a low C/N ratio wastewater enhanced denitrification treatment system is characterized in that: the low C/N ratio wastewater enhanced denitrification treatment system comprises the following components in sequence:
a feeding box (1);
an EGSB anaerobic reactor (2), wherein the EGSB anaerobic reactor (2) is provided with an EGSB internal circulating pump (2.1);
the device comprises an A/O carbon removal tank (3), wherein the front end of the A/O carbon removal tank (3) is provided with an anoxic stirrer (3.2), and the rear end of the A/O carbon removal tank is provided with a perforated aeration pipe (3.3) and a first water quality monitor (3.4) which are connected with an air compressor (3.1); the volume ratio of prime number front end to back end is 1: 3-4;
the bottom of the secondary sedimentation tank (4) is connected with the inlet of the A/O decarbonization tank (3) through a sludge reflux pump (4.1);
the middle water tank (5), the middle water tank (5) is provided with a middle water tank lifting pump (5.1) and a second water quality monitor (5.2); the middle water tank (5) is connected with the feeding tank (1) through a feeding transfer pump (1.2), and the feeding transfer pump (1.2) is used for conveying the feeding liquid to an inlet of the middle water tank (5) in an overrunning manner;
an Anamox reactor (6), wherein the Anamox reactor (6) is provided with an Anamox reactor internal circulation pump (6.1) and an Anamox reactor external circulation pump (6.2), the Anamox reactor external circulation pump (6.2) is connected with the inlet of the A/O carbon removal tank (3), and the Anamox reactor external circulation pump (6.2) is used for refluxing supernatant to the inlet of the A/O carbon removal tank (3); HDPE plastic carriers (6.4) are filled in the Anamox reactor (6), and a third water quality monitor (6.3) is arranged at the top of the Anamox reactor;
a water producing tank (7);
the quick start method comprises the following steps:
step 1): inoculating sludge in an anaerobic tank of an urban sewage treatment plant in an EGSB anaerobic reactor (2), and controlling the concentration of the sludge to 4000-5000 mg/L and HRT=1-2 d;
step 2): planting denitrification sludge of an urban sewage treatment plant at the front end of the A/O decarbonizing tank (3), planting secondary sedimentation tank backflow sludge of the sewage treatment plant at the rear end, respectively controlling the concentration of the sludge at the front end and the rear end to be 3000-4000 mg/L, the concentration of dissolved oxygen at the front end to be 0.2-0.3 mg/L, the concentration of dissolved oxygen at the rear end to be 0.3-1.0 mg/L, the total HRT=2-3 d, the sludge backflow ratio to be 50-100%, and NO in effluent water 2 - -N：NH 3 + -N =1.30~1.35:1；
Step 3): mixing and inoculating river and lake sediment, denitrified sludge of an urban sewage treatment plant and optionally mature anaerobic ammonia oxidation sludge in an Anamox reactor (6), controlling the temperature to be 32-35 ℃, controlling the sludge concentration to be 3500-4500 mg/L, controlling the HRT=1-1.5 d, controlling the dissolved oxygen concentration to be 0.1-0.3 mg/L, and adding a HDPE plastic carrier and a low-concentration inorganic salt solution in a certain proportion; the mature anaerobic ammoxidation sludge is granular sludge with the average diameter of 2.0-3.0 mm and the relative abundance of AnAOB flora of more than 50%;
step 4): gradually increasing the internal circulation reflux ratio and the external circulation reflux ratio of the Anamox reactor (6), and controlling NH in the effluent 3 + -N <8mg/L，TN<20mg/L, and when the total nitrogen removal load of the anaerobic ammonia oxidation reaction is detected to be more than or equal to 0.3 gN/(L.d), the reactor is started successfully;
the internal circulation reflux ratio of the Anamox reactor is 100-200%, and the external circulation reflux ratio of the Anamox reactor is 200-400%; controlling the substrate concentration and the effluent quality of the reactor by adjusting the internal circulation reflux ratio and the external circulation reflux ratio of the Anamox reactor; when yielding water NH 3 + -N >When the concentration is 8mg/L, the internal circulation reflux ratio is gradually increased to 200 percent; when yielding water NH 3 + -N<8mg/L、TN>When the concentration is 20mg/L, the external circulation reflux ratio is gradually increased to 400 percent; wherein the internal circulation reflux proportion and the external circulation reflux proportion are gradually increased according to a gradient of 50%, and the reaction is continuously carried out for 10-12 h when one gradient is added until NH 3 + -N<8mg/L、TN<20mg/L。
2. The method for quickly starting up the low C/N ratio wastewater enhanced nitrogen removal system according to claim 1, wherein the low C/N ratio wastewater enhanced nitrogen removal system further comprises a PLC control cabinet (8); the device is characterized in that the first water quality monitor (3.4), the second water quality monitor (5.2) and the third water quality monitor (6.3) are connected with the PLC control cabinet (8), and the PLC control cabinet (8) adjusts the operation parameters of the feeding transfer pump (1.2), the air compressor (3.1), the sludge reflux pump (4.1), the Anamox reactor internal circulation pump (6.1) and the Anamox reactor external circulation pump (6.2) according to real-time monitoring water quality data output signals.
3. The method for rapid start-up of a low C/N ratio wastewater enhanced denitrification treatment system according to claim 1, wherein when NO 2 - -N and NH 3 + Mass concentration ratio of-N>At 1.35:1, NH is increased by reducing the air compressor (3.1) frequency or turning on the feed transfer pump (1.2) 3 + -N concentration.
4. The method for rapid start-up of a low C/N ratio wastewater enhanced denitrification treatment system according to claim 1, wherein when NO 2 - -N and NH 3 + Mass concentration ratio of-N<At 1.30:1, NH is reduced by increasing the frequency of the air compressor (3.1) or increasing the reflux ratio of the sludge reflux pump (4.1) 3 + -N concentration to achieve NO in the intermediate tank (5) 2 - -N and NH 3 + The mass concentration ratio of the-N is 1.30-1.35:1.
5. The method for quickly starting the low C/N ratio wastewater enhanced denitrification treatment system according to claim 1, wherein the sludge inoculated in the step 3) is formed by mixing river and lake sediment, denitrification sludge and mature anaerobic ammoxidation sludge according to a ratio of 4-6:3:1.
6. The method for quickly starting the low-C/N ratio wastewater enhanced denitrification treatment system according to claim 1, wherein the sludge inoculated in the step 3) is formed by mixing river and lake sediment and denitrifying sludge according to a ratio of 5-7:3 when no mature anaerobic ammonia oxidation sludge source exists.
7. The method for quickly starting up a low C/N ratio wastewater enhanced denitrification treatment system according to claim 1, wherein the inorganic salt in the low concentration inorganic salt solution in the step 3) is selected from NaCl, na 2 SO 4 、CaSO 4 、CaCl 2 Or one or more of KCl, wherein the concentration of the inorganic salt solution is 3-10 g/L.
8. The method for quickly starting a low C/N ratio wastewater enhanced denitrification treatment system according to claim 1, wherein the HDPE plastic carrier (6.4) is one or a combination of a plurality of porous hollow spheres, pall rings and built-in suspended fillers, the size is phi 20-25 mm, and the specific surface area is 500-800 m 2 /m 3 The porosity is greater than 92%, and the filling volume ratio is 20% -40%.
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CN110104773A (en) * 2019-04-30 2019-08-09 北京工业大学 The method and apparatus of the AOA Process for Treating Municipal of whole process Anammox strengthened denitrification
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EP2165982A1 (en) * 2008-09-17 2010-03-24 National University of Ireland, Galway A biological reactor for wastewater
CN104529084A (en) * 2014-12-31 2015-04-22 上海明诺环境科技有限公司 Industrial wastewater low-temperature anaerobic treatment device and treatment process thereof
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